Flood Risk Assessment Wales (FRAW)

Flood Risk Assessment Wales (FRAW) (Natural Resources Wales). Access: WMS / WFS / download. Formats: SHP, GeoJSON. Resolution: vector. Coverage: Wales. Pricing/licence: free (OGL).

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What's in it

Data offered docs-verified: flood risk from rivers · flood risk from the sea · flood risk from surface water and small watercourses · risk levels under review (areas where the assessment is under review over the next 6 months) · risk bands High / Medium / Low (annual chance of flooding)
Coverage docs-verified: Wales
Resolution docs-verified: 2m grid for national-scale modelling; local-scale models typically 2m-10m
Formats docs-verified: GeoJSON · Excel · CSV · GML 3.1.1 · GML 2.0 · DXF · OGC GeoPackage · Zipped Shapefile · PNG · PDF · JPEG · WMS · WFS
Access docs-verified: Free download under Open Government Licence (OGL); OWS (WMS/WFS) endpoints available; no authentication stated

Useful for

Use cases llm-inferred: Fluvial and surface water flood screening for a Welsh site in an FRA or planning constraints review · Coastal flood risk screening for a coastal scheme or outfall siting in Wales · Flood risk constraints layer in GIS for site selection and early-stage drainage strategy · Checking Risk Level Under Review areas before relying on FRAW bands for a project
Audience llm-inferred: flood consultants · drainage engineers · hydrologists · planners · GIS analysts

Limitations

Constraints docs-verified: Indicative areas at risk, not specific to individual properties; NRW holds no property construction data · Flood defences reduce but do not completely stop flood chance, as they can be overtopped or fail · Maps should be displayed at a maximum zoom of 1:5,000 with 1:10,000 base mapping for context · Risk bands are onion-skin layers with no overlap and should be combined into one layer per flood source · Wales only · Entry metadata lists resolution as 'vector', but the docs describe grid-based modelling; the catalogue entry should be checked

Licence: free (OGL)
Authentication: Unknown — review source docs
GitHub stars: Unknown
Last commit: Unknown
Last successful page check: 16/10/2026
Page health: page reachable
Package: Not recorded
Verification: Not independently verified

Provenance & evidence

Verified 2026-10-16 (curl HTTP 200).

Metadata observed 14/10/2026 · research sweep: sweep-2026-10-16 (named: UK)

https://datamap.gov.wales/layergroups/inspire-nrw:FloodRiskAssessmentWales